Electro-mechanical works are integral and important part of construction of a building comprising of many components such as internal electrification, sub-station, HVAC system, elevator/escalators, pump, compound lighting, fire detection and protection system, building security, building automation, medical gas pipeline system, stage light and sound system, computer networking system, solar system, fountain etc. Special knowledge and expertise is necessary for proper planning and efficient and safe implementation of these works. Public Works Department has an Electro-mechanical unit to facilitate the planning, design and implementation of electro-mechanical components of building work.

It consists of five circles ( E/M Circle-1,2,3, Planning and Design (P&D) Circle, E/M Chittagong Circle) headed by five Superintending Engineers under the leadership of an Additional Chief Engineer E/M at PWD Head Quarter. Under the E/M Circle 1, 2 and 3, there are ten E/M working Divisions headed by Executive Engineers which include two Divisions called Wood Workshop Division and Workshop Division. The responsibility of the Wood Workshop Division is to produce and supply all kinds of furniture for all Government projects throughout the country. There are two Divisions under E/M P&D Circle. E/M Circle Chittagong is comprised of two working Divisions and one Planning and Design Division (P&D). E/M P&D Division also prevails in Rajshahi & Khulna under Rajshahi and Khulna PWD Zone.

While E/M Planning and Design Circles and Divisions are involved in planning and design of electro-mechanical components of a work, the working Divisions are responsible for implantation as well as maintenance of such components in existing infrastructure. Over the past years, officers of PWD E/M unit are carrying the responsibility of maintaining the electro-mechanical components of many important buildings of the country such as National Parliament Building, Bangabhan ( President's House), Office of the Prime Minister, Gonobhabon, Dhaka Medical College and Hospital, all the hospitals at SB Nagar Dhaka, Bangladesh Secretariat and many more.

Another important work includes preparation of the book of Schedule of Rates and Analysis incorporating the items required for construction and maintenance of public buildings related to E/M work. It is published by PWD E/M unit from time to time. Being an authentic document, it is not only used by PWD but also used by other government, semi-government or private sector builders.